JP2023054853A - Pipe joint, spacer arranged at pipe joint and split piece constituting spacer - Google Patents

Abstract

To provide a pipe joint which can facilitate the centering work of a spacer when attaching the spacer.SOLUTION: A spacer 40 for limiting the relative movement of a spigot 12 and a receptacle 15 in a pipe axial direction C is attached between a tip part 12a of the spigot 12 and a depth end face 19 of the receptacle 15, and the spacer 40 has a cylindrical spacer main body 41 which is sandwiched between the tip part 12a of the spigot 12 and the depth end face 19 of the receptacle 15, a centering abutment face 45 abutting on an internal peripheral face 20 of the receptacle 15, and a separation face 47 separating from the depth end face 19 of the receptacle 15 in a separation direction A of the spigot 12. A clearance 48 surrounded by the separation face 47 of the spacer 40, and the depth end face 19 and the internal peripheral face 20 of the receptacle 15 is formed, the clearance 48 is formed outside a contact part 50 in a radial direction B in which an end part 41a of the spacer main body 41 contacts the depth end face 19 of the receptacle 15, and the separation face 47 is formed over a clearance between the contact part 50 and the centering abutment face 45 in the radial direction B.SELECTED DRAWING: Figure 4

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint having an anti-separation function, a spacer provided in this pipe joint, and split pieces constituting the spacer.

Conventionally, as a pipe joint of this type, for example, as shown in FIG. A lock ring 206 is accommodated in the groove 205 , and a projection 207 that can be engaged with the lock ring 206 from the inner side of the receptacle 204 is formed on the outer peripheral surface of the insertion opening 202 .

A rubber ring 208 for sealing is provided between the outer peripheral surface of the insertion port 202 and the inner peripheral surface of the socket 204 , and the rubber ring 208 is interposed between the outer peripheral surface of the insertion port 202 and the inner peripheral surface of the socket 204 . A pushing ring 209 is fastened to the open end face of the socket 204 with a bolt and nut 210 .

Further, the pipe joint 200 is provided with a spacer 212 for restricting relative movement in the pipe axial direction C between the insertion port 202 and the socket 204 . The spacer 212 is a cylindrical member, and is sandwiched between the distal end portion of the insertion opening 202 and the inner end surface 213 of the receiving opening 204 .

According to this, by providing the spacer 212, the relative movement of the insertion port 202 and the receiving port 204 in the pipe axial direction C is restricted, so that a portion where an uneven force acts on the pipe line (for example, a pipe line ), the pipe joint 200 is restrained so as not to move, and the expansion and contraction function between the insertion port 202 and the socket 204 and the bending function between the insertion port 202 and the socket 204 are restricted. be.

As a result, it is possible to prevent the pipeline from expanding, contracting or bending in the direction in which the uneven force acts, which adversely affects the sealing performance of the pipe joint 200 .

Incidentally, the pipe joint 200 including the spacer 212 as described above is described in Patent Document 1 below, for example.

JP 2004-162854

However, in the conventional type described above, the outer peripheral surface 212a of the spacer 212 is separated from the inner peripheral surface 204a of the socket 204, and there is a gap between the outer peripheral surface 212a of the spacer 212 and the inner peripheral surface 204a of the socket 204. 214 are formed all around. Therefore, when the spacer 212 is mounted inside the socket 204, the position of the spacer 212 tends to shift in the radial direction B, and there is a problem in that it takes time and effort to align the center of the spacer 212 with the center of the socket 204. be.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pipe joint that facilitates centering of the spacer when mounting the spacer, a spacer provided in the pipe joint, and a split piece that constitutes the spacer.

In order to achieve the above object, the first invention provides a socket in which the socket is inserted into the socket,
A lock ring is accommodated in a groove formed on the inner peripheral surface of the socket,
A pipe joint in which an engaging portion that can be engaged with a lock ring from the inner side of the socket is formed on the outer peripheral surface of the insertion port,
A spacer for restricting relative movement of the spigot and the socket in the tube axial direction is mounted between the tip of the spigot and the inner end face of the socket,
The spacer comprises a cylindrical spacer main body sandwiched between the tip of the receptacle and the back end surface of the receptacle, a centering abutment surface abutting against the inner peripheral surface of the receptacle, and a spaced surface spaced apart from the inner end surface of the socket,
A gap is formed between the separation surface of the spacer, the inner peripheral surface of the socket, and the inner peripheral surface of the socket,
The gap is outside in the radial direction of the contact portion where the end portion of the spacer body in the tube axis direction contacts the inner end surface of the socket,
The spacing surface is formed between the contact portion and the centering contact surface in the radial direction.

According to this, the centering contact surface of the spacer abuts against the inner peripheral surface of the socket, so that the mounting position of the spacer does not deviate in the radial direction, and the center of the spacer coincides with the center of the socket. , when installing the spacer, it is possible to facilitate the centering operation of the spacer with respect to the receptacle.

In addition, even if a force in the direction of insertion (hereinafter referred to as an insertion force) acts on the insertion opening and the reaction force of the insertion force acts on the spacer main body from the inner end surface of the socket, the spaced surface of the spacer and the inner surface of the socket will not move. A gap is formed between the spacer and the end face, and the separation face of the spacer is separated from the inner end face of the socket without contacting the inner end face of the socket. It has little effect on surfaces. As a result, deformation of the portion of the spacer where the separating surface is formed can be reduced.

In the pipe joint according to the second aspect of the invention, the spacer has a protrusion projecting radially outward from the outer periphery of the spacer body,
a centering abutment surface is formed on the outer periphery of the projection,
The separation surface is formed on the protrusion and is inclined in the direction of removal of the insertion port from the contact portion toward the centering contact surface,
The contact portion is formed at the boundary between the end face of the spacer body facing the inner end face of the socket and the separation face.

According to this, even if an insertion force acts on the insertion port and the reaction force of the insertion force acts on the spacer main body from the inner end surface of the socket, there is a gap between the separation surface of the spacer and the inner end surface of the socket. Since the spacing surface of the spacer is spaced from the inner end surface of the socket without contacting it, the reaction force of the insertion force hardly acts on the spacing surface of the spacer from the inner end surface of the socket. As a result, deformation of the protrusions of the spacer can be reduced.

In the pipe joint of the third aspect of the present invention, the protrusions are formed at a plurality of locations on the spacer body in the pipe axial direction,
The separation surface is formed on the protruding portion at the farthest end of the socket,
a centering abutment surface is formed on the outer periphery of each protrusion;
A recessed portion that is recessed inward in the radial direction is formed between the projecting portions that face each other in the pipe axial direction.

According to this structure, the centering contact surfaces of the plurality of protrusions of the spacer are brought into contact with the inner peripheral surface of the receptacle, thereby stabilizing the posture of the spacer when the spacer is mounted. Workability is improved.

In addition, since the depressions are formed between the protrusions, the weight of the spacer can be reduced.

In the pipe joint according to the fourth aspect of the invention, the contact portion is located in a region between the outer peripheral surface and the inner peripheral surface of the spacer body in the radial direction.

According to this, when an insertion force acts on the insertion port, the distance in the radial direction between the point where the insertion force acts on the spacer body and the point where the reaction force acts on the spacer body (that is, the contact portion) is shortened. Therefore, the bending moment acting on the spacer is reduced, and most of the force acting on the spacer becomes compressive force in the tube axis direction, thereby easily maintaining the strength of the spacer.

A fifth invention is a spacer provided in the pipe joint according to any one of the first to fourth inventions,
divided into a plurality of arcuate segments in the circumferential direction,
The ends of the split pieces that are adjacent in the circumferential direction are connected to each other.

According to this, a cylindrical spacer can be assembled by connecting a plurality of split pieces inside the socket.

A sixth invention is a split piece constituting the spacer according to the fifth invention,
It has connecting portions at both ends.

According to this, by connecting the connecting portion of one divided piece and the connecting portion of the other divided piece adjacent in the circumferential direction with the connecting device, the two divided pieces can be connected to each other.

As described above, according to the present invention, the centering contact surface of the spacer abuts against the inner peripheral surface of the socket so that the center of the spacer matches the center of the socket. centering work can be facilitated.

It is a figure of the pipeline which has a pipe joint in embodiment of this invention. It is sectional drawing of a pipe joint equally. It is a figure when diameter-expanding the lock ring with which a pipe joint is equipped equally. It is a partial expanded sectional view of a pipe joint same. It is a front view of the spacer with which a pipe joint is equipped equally. It is a front view of the division|segmentation piece which comprises the spacer with which a pipe joint is equipped equally. FIG. 7 is a view taken along line XX in FIG. 6; 7 is a view taken along the line YY in FIG. 6; FIG. FIG. 7 is a view taken along line ZZ in FIG. 6; It is sectional drawing which shows the connection structure of the division|segmentation pieces of a spacer equally. It is a figure of the connection plate for connecting the division|segmentation pieces of a spacer equally. It is a figure which shows the procedure which assembles a spacer equally. It is a figure which shows the procedure which assembles a spacer equally. Similarly, it is a figure which shows the procedure to assemble a spacer, and is the enlarged display of the peripheral part of the bolt for centering provided in the lower semicircle. It is a figure of the jig|tool for bolt fixation used when assembling a spacer equally. It is a figure which shows the procedure which assembles a spacer equally. Similarly, it is a figure which shows the procedure which assembles a spacer, Comprising: It enlarges and displays the peripheral part of the bolt for centering. It is a figure which shows the procedure which assembles a spacer equally. It is a figure which shows the procedure which assembles a spacer equally. Similarly, it is a figure which shows the procedure which assembles a spacer, Comprising: It enlarges and displays the peripheral part of the bolt for centering. It is a figure which shows the procedure which assembles a spacer equally. It is sectional drawing which shows the joining method of the pipe|tube of a pipe joint equally. It is sectional drawing which shows the force which acts on the spacer with which the pipe joint was equipped equally. FIG. 10 is a cross-sectional view of a conventional pipe joint;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
As shown in FIG. 1, 1 is a pipeline formed by joining a plurality of pipes.

In such a pipe line 1, 10 is a pipe joint having a disconnection prevention function, and an insertion port 12 formed at one end of one pipe 11 and a socket 15 formed at the other end of the other pipe 14 is inserted in the Ductile iron pipes or the like are used for these pipes 11 and 14, for example.

FIG. 2 is a cross-sectional view of the pipe joint 10, and an insertion opening protrusion 17 (an example of an engaging portion) is formed along the entire outer circumference of the insertion opening 12. As shown in FIG. The inserting opening protrusion 17 is formed at a position recessed by a predetermined length from the front end surface 12 a of the inserting opening 12 in the direction A of removing the inserting opening 12 .

The receptacle 15 has an annular inner end face 19 at its inner end. The inner peripheral surface 19 is formed along the entire circumference from the inner peripheral surface 20 of the socket 15 toward the inside in the radial direction B, and faces the distal end surface 12a of the insertion port 12 in the pipe axial direction C. As shown in FIG.

A lock ring accommodating groove 21 (an example of a groove) is formed on the inner peripheral surface 20 of the receptacle 15 over the entire circumference. A lock ring 22 and an annular pressing member 23 that presses the lock ring 22 inward in the radial direction B are housed in the lock ring housing groove 21 .

As shown in FIG. 3, the lock ring 22 is a one-piece structure ring cut at one point. It has elasticity such that when it is removed from the cut portion 25, it shrinks and returns to its original diameter.

As shown in FIG. 2 , the insertion opening projection 17 engages with the lock ring 22 from the inner side of the socket 15 in the direction A of removing the insertion opening 12 , thereby preventing the insertion opening 12 from being separated from the socket 15 . can be prevented.

A seal ring 30 is provided on the side of the opening end face 29 of the receptacle 15 relative to the lock ring 22 to seal the outer peripheral surface of the receptacle 12 and the inner peripheral surface of the receptacle 15 by being compressed in the radial direction B. there is The seal ring 30 is a rubber ring (rubber ring) and is inserted between the outer peripheral surface of the insertion port 12 and the inner peripheral surface of the receptacle 15 .

A press ring 31 is provided on the opening end face 29 of the socket 15 to press the seal ring 30 toward the inner side of the socket 15 . The press ring 31 has an abutting portion 32 that contacts the open end face 29 of the socket 15 , and is connected to the open end face 29 of the socket 15 by a plurality of T-head bolts 33 and nuts 34 .

A backup ring 36 is provided between the lock ring 22 and the seal ring 30 in the pipe axial direction C to prevent the seal ring 30 from being pushed by the push ring 31 and entering the lock ring accommodating groove 21 . ing. The backup ring 36 is arranged adjacent to the lock ring 22, is a split ring with one cut, and is made of elastic material such as resin.

A spacer 40 is mounted between the front end surface 12 a of the insertion opening 12 and the inner end surface 19 of the reception opening 15 to restrict the relative movement of the insertion opening 12 and the socket 15 in the tube axial direction C. As shown in FIG. As shown in FIGS. 2, 4, and 5, the spacer 40 includes a cylindrical spacer body 41 sandwiched between the front end face 12a of the insertion port 12 and the inner end face 19 of the socket 15, and the spacer body 41. It has first and second protrusions 42 and 43 that protrude outward in the radial direction B from the outer peripheral surface 41b. The first and second projections 42 and 43 are formed at both ends (two locations) of the spacer main body 41 in the pipe axis direction C over the entire circumference. Of these, the first protrusion 42 is formed at one end of the spacer body 41, which is the end closer to the inner end surface 19 of the socket 15, and the second protrusion 43 is formed at the end closer to the distal end surface 12a of the insertion port 12. is formed at the other end of the spacer body 41 which is the end of the spacer body 41 .

As shown in FIGS. 4 and 9, the first protrusion 42 and the second protrusion 43 have the same cross-sectional shape, and the cross-sections of the first and second protrusions 42 and 43 are radially It is formed in a trapezoidal shape in which the width W in the tube axis direction C decreases toward the outside of B. Centering abutment surfaces 45 that abut against the inner peripheral surface 20 of the socket 15 are formed on the outer peripheries of the first and second projections 42 and 43 over the entire circumference.

A first projection 42 (an example of a projection on the farthest end side of the receptacle 15 ) is formed with a separation surface 47 that is separated from the rear end surface 19 of the receptacle 15 in the detachment direction A of the insertion port 12 over the entire circumference. It is As shown in FIGS. 2 and 4, inside the socket 15, a gap 48 is formed over the entire circumference, surrounded by the separation surface 47, the inner end surface 19 of the socket 15, and the inner peripheral surface 20 of the socket 15. It is
The gap 48 is located outside in the radial direction B of the contact portion 50 where one end portion of the spacer body 41 in the tube axis direction C contacts the inner end surface 19 of the socket 15 . As shown in FIG. 4 , the contact portion 50 has point contact in a cross section along the radial direction B of the pipe joint 10 , but circular line contact in the circumferential direction D of the pipe joint 10 .

As shown in FIGS. 4, 8, and 9, the spacing surface 47 is formed between the contact portion 50 and the centering contact surface 45 of the first protrusion 42 in the radial direction B. The centering contact surface 45 of the first protrusion 42 is inclined from 50 toward the detachment direction A of the insertion port 12 .

The contact portion 50 is formed along the entire circumference at the boundary portion between the one end surface 41a of the spacer body 41 facing the inner end surface 19 of the socket 15 and the separation surface 47. It is positioned in a region between the inner peripheral surface 41c.

Between the protrusions 42 and 43 that face each other in the pipe axis direction C, a recessed portion 51 that is recessed inward in the radial direction B is formed over the entire circumference.

5 to 9, the spacer 40 is divided in the circumferential direction D into a plurality of (for example, six in FIG. 5) arcuate division pieces 60a to 60f. That is, each of the divided pieces 60a to 60f has a spacer main body 41 and first and second protrusions 42 and 43 which are divided into a plurality of pieces in the circumferential direction D. As shown in FIG.

Ends of the split pieces 60a to 60f adjacent in the circumferential direction D are connected by a connecting device 61. As shown in FIG. As shown in FIGS. 5, 10 and 11, the connecting device 61 has a connecting plate 62, a bolt 63 and a washer 64. As shown in FIG. Two through-holes 65 and 66 are formed in the connecting plate 62, one of which the through-hole 65 is an elongated hole.

As shown in FIGS. 6 and 7, screw holes 67 (an example of connecting portions) are formed at both ends of each of the split pieces 60a to 60f. These screw holes 67 are formed in the inner peripheral surface 41c of the spacer main body 41 of each split piece 60a-60f.

As shown in FIG. 10, two bolts 63 are inserted through the through holes 65 and 66 of the washer 64 and the connecting plate 62, and the threaded holes 67 of the divided pieces 60a to 60f adjacent in the circumferential direction D. One split piece 60a-60f and the other split piece 60a-60f are connected by screwing into the screw hole 67 of the other split piece 60a-60f and tightening.

Further, as shown in FIGS. 6 to 8, a plurality of centering holes 70 are formed in one of the end faces in the circumferential direction D of the split pieces 60a to 60f. These centering holes 70 are opened in the end faces of the first and second protrusions 42, 43 of each split piece 60a-60f.

As shown in FIGS. 6, 7, and 9, an insertion hole passing through the outer peripheral surface 41b and the inner peripheral surface 41c of the spacer body 41 is provided at the center of each of the split pieces 60a to 60f in the circumferential direction D. 71 is formed.

A method for joining the pipes 11 and 14 in the pipe joint 10 will be described below.

First, the spacer 40 is set inside the socket 15 as follows.

As shown in FIG. 12, three split pieces 60 a to 60 c occupying the lower half of the inner peripheral surface 20 of the socket 15 are set inside the socket 15 . Then, as shown in FIG. 10, using a connection plate 62, a bolt 63, and a washer 64, the lower half split pieces 60a to 60c are connected to each other as shown in FIG. A lower semicircular body 73 is formed.

Centering holes 70 are opened in both end faces 74 and 75 of the lower semicircular body 73 in the circumferential direction D, and as shown in FIGS. A jig 77 is set.

As shown in FIG. 15, the bolt fixing jig 77 is made of rubber for aligning the directions of a plurality of centering bolts 81 (see FIGS. 13 and 14) and for preventing them from co-rotating. It is an elastically deformable plate and has two through-holes 78 and a notch 79 penetrating on both front and back sides in the plate thickness direction. The notch 79 is formed such that a part (approximately 1/4) of the inner circumference of the through hole 78 is open to the outer edge of the bolt fixing jig 77 .

Thereafter, as shown in FIGS. 13 and 14, substantially lower halves of the four centering bolts 81, two on each side, are inserted into the through holes 78 (see FIG. 15) of the respective bolt fixing jigs 77 and the lower halves thereof. The centering holes 70 are inserted into both end faces 74 and 75 of the circular body 73 , and the nuts 82 are screwed onto the centering bolts 81 and brought into contact with the upper surface of the bolt fixing jig 77 .

At this time, since the inner circumference of the through hole 78 of the bolt fixing jig 77 and the outer circumference of the centering bolt 81 are in contact with each other, it is possible to prevent the direction of each centering bolt 81 from being deviated. The direction of each centering bolt 81 can be easily aligned.

Next, as shown in FIGS. 16 and 17, approximately the upper half of each centering bolt 81 protruding upward from both end surfaces 74 and 75 of the lower semicircular body 73 is attached to another pair of left and right upper split pieces. It is inserted from below into the centering holes 70 of 60d and 60e. In this state, as shown in FIG. 18, tension rods 84 are inserted into the insertion holes 71 (see FIGS. 6 and 7) of one of the upper left and right split pieces 60d and the insertion holes 71 of the other split piece 60e. By inserting and stretching, the pair of left and right upper split pieces 60d and 60e are held so as not to drop off from the lower semicircular body 73. As shown in FIG.

After that, the uppermost split piece 60f is set between a pair of left and right upper split pieces 60d and 60e, and the upper half split pieces 60d to 60f are connected to each other using a connecting plate 62, a bolt 63 and a washer 64. As a result, an upper semicircular body 85 corresponding to the upper half of the spacer 40 is formed, as indicated by the solid line in FIG.

After that, as shown in FIG. 19, a vertically elongated columnar jack device 86 is set in the socket 15 . The jack device 86 has a hydraulic cylinder 97 for raising and lowering the column 95 , a base plate 96 provided at the lower end of the hydraulic cylinder 97 , and a receiving plate 98 provided at the upper end of the column 95 .

The jack device 86 is operated, the piston rod 97a of the hydraulic cylinder 97 is extended, the upper semicircular body 85 is lifted by the receiving plate 98, and the outer periphery of the upper semicircular body 85 is brought into contact with the inner peripheral surface 20 of the socket 15.

In this state, as shown in FIG. 20, each nut 82 is turned and lifted so that both end surfaces 88 and 89 of the upper semicircular body 85 in the circumferential direction D are brought into contact with each nut 82 . At this time, the centering bolt 81 is fixed by contacting the inner periphery of the through hole 78 of the bolt fixing jig 77 and the outer periphery of the centering bolt 81 , so that the centering bolt 81 and the nut 82 are fixed. It is possible to prevent them from going around together.

Thereafter, as shown in FIG. 21, the tension rod 84 is pulled out from the insertion hole 71 and removed from the split pieces 60d and 60e of the upper semicircular body 85, and the jack device 86 is removed from the socket 15 and removed. 20 and 21, both bolt fixing jigs 77 are removed from the end faces 74, 75 of the lower semicircular body 73. As shown in FIG. At this time, by horizontally moving the bolt fixing jig 77 toward the inner side E in the radial direction B, the centering bolt 81 moves from the through hole 78 of the bolt fixing jig 77 to the notch 79 (see FIG. 15). The bolt fixing jig 77 can be removed because the bolt fixing jig 77 is removed relatively outward.

As a result, as shown in FIG. 5 , the upper semicircular body 85 can be moved through the centering bolt 81 and the nut 82 while the outer periphery of the upper semicircular body 85 is in contact with the inner peripheral surface 20 of the socket 15 . The spacer 40 is set inside the receptacle 15 in a centered state.

In addition, the backup ring 36, the seal ring 30 and the pressing ring 31 are externally fitted to one of the pipes 11 in advance. Then, the lock ring 22 and the pressing member 23 are housed (set) in the lock ring housing groove 21 of the other tube 14 . Then, as shown in FIG. 3, the width 26 of the cut portion 25 of the lock ring 22 is enlarged by an expander 27 to enlarge the diameter of the lock ring 22 . Next, as shown in FIG. 22, an L-shaped diameter expansion retainer 90 is inserted into the cut portion 25 of the lock ring 22, the expander 27 is removed, and the lock ring 22 is maintained in an expanded state.

After that, the insertion port 12 is inserted into the socket 15 , the insertion port projection 17 is passed from the socket opening end side of the lock ring 22 to the socket inner side, and the distal end face 12 a of the insertion port 12 is inserted into the spacer 40 of the spacer 40 . It is brought into contact with the other end surface 41d of the main body 41 . At this time, since the lock ring 22 is maintained in a diameter-expanded state by the diameter expansion holder 90 , the insertion opening protrusion 17 easily passes through the inside of the lock ring 22 .

Next, the diameter expansion holder 90 is removed and the diameter of the lock ring 22 is reduced. As a result, the lock ring 22 clings to the outer periphery of the insertion opening 12. - 特許庁

After that, the backup ring 36 is moved in the tube axial direction C and pushed into the socket 15 to be adjacent to the lock ring 22 .

Further, the seal ring 30 is moved in the pipe axis direction C and inserted between the outer peripheral surface of the insertion port 12 and the inner peripheral surface of the socket 15, and a T-head bolt 33 and a nut 34 are used to secure the push ring 31 to the socket. 15, and tighten the T-head bolt 33 and nut 34 until the contact portion 32 of the press ring 31 contacts the open end face 29 of the socket 15. As shown in FIG. As a result, the seal ring 30 is pushed between the outer peripheral surface of the insertion port 12 and the inner peripheral surface of the socket 15 and compressed in the radial direction B, as shown in FIG. As a result, the pipes 11 and 14 are joined together at the pipe joint 10 .

The operation of the pipe joint 10 having such a spacer 40 will be described below.

As shown in FIG. 4, the centering abutment surface 45 of the spacer 40 abuts against the inner peripheral surface 20 of the socket 15, so that the mounting position of the spacer 40 does not deviate in the radial direction B, and the spacer 40 does not move. Since the center coincides with the center of the socket 15 , the centering operation of the spacer 40 with respect to the socket 15 can be facilitated when mounting the spacer 40 . At this time, since the centering contact surfaces 45 of the first and second protrusions 42 and 43 respectively contact the inner peripheral surface 20 of the socket 15, the posture of the spacer 40 is stabilized when the spacer 40 is mounted. , the workability of centering the spacer 40 is improved.

Moreover, since the depressed portion 51 is formed between the projections 42 and 43, the weight of the spacer 40 can be reduced.

Further, as shown in FIG. 23, a force F1 in the insertion direction (hereinafter referred to as an insertion force F1) acts on the insertion port 12, and a reaction force F2 of the insertion force F1 is applied from the inner end surface 19 of the socket 15 to the spacer main body 41. , a gap 48 is formed between the spaced surface 47 of the spacer 40 and the innermost end surface 19 of the socket 15 , and the spaced surface 47 of the spacer 40 does not contact the innermost surface 19 of the socket 15 . Since it is separated from the inner end surface 19 , the reaction force F2 acts on the spacer main body 41 from the contact portion 50 and hardly acts on the separation surface 47 of the spacer 40 . As a result, deformation of the portion of the spacer 40 where the separation surface 47 is formed, that is, the deformation of the first protrusion 42 can be reduced.

Furthermore, as shown in FIGS. 8, 9, and 23, the contact portion 50 is located in the region between the outer peripheral surface 41b and the inner peripheral surface 41c of the spacer body 41 in the radial direction B, so that the insertion force A distance L in the radial direction B between a point 52 where F1 acts on the other end surface 41d of the spacer main body 41 and a point where the reaction force F2 acts on the one end surface 41a of the spacer main body 41 (that is, the contact portion 50) is shortened. Therefore, the bending moment acting on the spacer 40 is reduced, and most of the force acting on the spacer 40 becomes compressive force in the pipe axis direction C, thereby making it possible to easily maintain the strength of the spacer 40 .

In the above embodiment, as shown in FIG. 1, both the one pipe 11 and the other pipe 14 are straight pipes, and the configuration of the pipe joint 10 for both pipes 11 and 14 is shown. Either one of the pipes 14 may be a curved pipe and the other a straight pipe, or a pipe joint in which one of the two pipes 11 and 14 is a T-shaped pipe and the other is a straight pipe. There may be.

In the above embodiment, as shown in FIG. 2, the spacer 40 has a spacer main body 41 and two protrusions 42 and 43, but it may have one or more than three protrusions. There may be. Further, the spacer 40 has the recessed portion 51 between the protrusions 42 and 43, but the recessed portion 51 may be buried and eliminated.

In the above-described embodiment, as shown in FIG. 5, the spacer 40 is divided into six divided pieces 60a to 60f, but the number is not limited to six. may

10 Pipe joint 12 Insertion opening 12a Tip end surface 15 of insertion opening Receptacle 17 Insertion opening protrusion (engaging portion)
19 Deep end face of socket 20 Inner peripheral surface of socket 21 Lock ring accommodating groove (groove)
22 Lock ring 40 Spacer 41 Spacer main body 41a One end surface 41b of spacer main body Outer peripheral surface 41c of spacer main body Inner peripheral surfaces 42, 43 of spacer main body Protrusion 45 Centering contact surface 47 Spacing surface 48 Gap 50 Contact portions 60a to 60f Split piece 67 Screw hole (connection)
A Withdrawal direction B Radial direction C Tube axial direction D Circumferential direction

Claims (6)

The spigot is inserted into the socket,
A lock ring is accommodated in a groove formed on the inner peripheral surface of the socket,
A pipe joint in which an engaging portion that can be engaged with a lock ring from the inner side of the socket is formed on the outer peripheral surface of the insertion port,
A spacer for restricting relative movement of the spigot and the socket in the tube axial direction is mounted between the tip of the spigot and the inner end face of the socket,
The spacer comprises a cylindrical spacer main body sandwiched between the tip of the receptacle and the back end surface of the receptacle, a centering abutment surface abutting against the inner peripheral surface of the receptacle, and a spaced surface spaced apart from the inner end surface of the socket,
A gap is formed between the separation surface of the spacer, the inner peripheral surface of the socket, and the inner peripheral surface of the socket,
The gap is outside in the radial direction of the contact portion where the end portion of the spacer body in the tube axis direction contacts the inner end surface of the socket,
A pipe joint, wherein the separation surface is formed radially between the contact portion and the centering contact surface. The spacer has a protrusion projecting radially outward from the outer periphery of the spacer body,
a centering abutment surface is formed on the outer periphery of the projection,
The separation surface is formed on the protrusion and is inclined in the direction of removal of the insertion port from the contact portion toward the centering contact surface,
2. The pipe joint according to claim 1, wherein the contact portion is formed at a boundary portion between the end face of the spacer body facing the inner end face of the socket and the separation face. The protrusions are formed at a plurality of locations on the spacer body in the pipe axis direction,
The separation surface is formed on the protruding portion at the farthest end of the socket,
a centering abutment surface is formed on the outer periphery of each protrusion;
3. The pipe joint according to claim 2, wherein recessed portions that are recessed inward in the radial direction are formed between the projecting portions that face each other in the pipe axial direction. 4. The pipe joint according to any one of claims 1 to 3, wherein the contact portion is located in a region between the outer peripheral surface and the inner peripheral surface of the spacer body in the radial direction. A spacer provided in the pipe joint according to any one of claims 1 to 4,
divided into a plurality of arcuate segments in the circumferential direction,
A spacer characterized in that ends of split pieces adjacent in a circumferential direction are connected to each other. A split piece constituting the spacer according to claim 5,
A split piece of a spacer, characterized by having connecting portions at both ends.

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